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Adjustment Procedure:
SPG 422 Service Manual (B034000 and above)
5–5
g. Check the sync amplitude and readjust R143 as necessary. If R130
requires readjusting, check the PAL version to be sure that it remains
within specifications.
h. Repeat this procedure with the other Black outputs. Use the list below to
select which potentiometer to adjust and channel to view.
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
Black 1
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
R143
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
Black 2
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
R161
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
CH B1 on the 1780/1781
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
Black 3
ÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁ
R14
ÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁ
Option 1 only
(connect to CH A)
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
Black 4
ÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁ
R28
ÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁ
Option 1 only
(connect to CH B1)
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
Black 5
ÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁ
R56
ÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁ
Option 1 only
(connect to CH B2)
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
Black 6
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
R42
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Option 1 only
(connect to CH B3)
5. Black Burst Sin(x)/x Adjustment
a. Connect the equipment as shown in Figure 5–1.
b. Use the SPG 422 front panel to output a PAL signal for Black 1.
c.
View the Black 1 output (CH A) on the 1781 PAL vectorscope/wave-
form monitor.
d. Adjust C130 Sin(x)/x on the Output board for proper subcarrier
amplitude (300 mV
p-p
±
15 mV).
e.
Check for proper SCH phase (0
°
±
5
°
), and adjust C130 if necessary.
f.
View the Black 1 output (CH A) on the 1780 NTSC vectorscope/wave-
form monitor.
g. Change the Black 1 to output an NTSC signal, using the SPG 422 front
panel.
h. Check that the subcarrier is at its proper level (40 IRE
p-p
±
2 IRE) and
adjust as necessary.
i.
Check that the SCH phase is within specification (0
°
±
5
°
), and adjust if
necessary.
j.
Repeat swapping from NTSC to PAL until both subcarrier levels and
SCH phases are within specification.
k. Repeat procedure with the Black 2 output CH B1), adjusting C136.
Summary of Contents for SPG 422
Page 4: ......
Page 14: ...Service Safety Summary x SPG 422 Service Manual B034000 and above ...
Page 17: ......
Page 62: ......
Page 67: ......
Page 92: ......
Page 96: ...Performance Verification 4 4 SPG 422 Service Manual B034000 and above ...
Page 102: ...Performance Verification 4 10 SPG 422 Service Manual B034000 and above ...
Page 136: ...Performance Verification 4 44 SPG 422 Service Manual B034000 and above ...
Page 137: ......
Page 144: ......
Page 158: ...Maintenance 6 14 SPG 422 Service Manual B034000 and above ...
Page 159: ......
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Page 223: ...9 3 SPG 422 Service Manual SPG 422 Component Digital Sync Generator FRONT PANEL 1 ...
Page 224: ...SPG 422 Service Manual 9 4 ...
Page 226: ...SPG 422 Service Manual 9 6 A2 Digital Board Static Sensitive Devices See Maintenance Section ...
Page 227: ...9 7 SPG 422 Service Manual SPG 422 Component Digital Sync Generator CPU 1 ...
Page 228: ...SPG 422 Service Manual 9 8 A7 Serial Filter ...
Page 229: ...9 9 SPG 422 Service Manual SPG 422 Component Digital Sync Generator CPU I O 2 ...
Page 230: ...SPG 422 Service Manual 9 10 ...
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Page 239: ...9 19 SPG 422 Service Manual SPG 422 Component Digital Sync Generator 108 MHz OSCILLATOR 7 ...
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Page 241: ...9 21 SPG 422 Service Manual SPG 422 Component Digital Sync Generator FINE PHASE 8 ...
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